Buggy code:
listaCT = new JList ( ) ; panelCURP = new JPanel ( ) ; scrollPlantilla = new JScrollPane ( ) ; listaPlantilla = new JList ( ) ; panelDocumentos = new JPanel ( ) ; scrollDocumentos = new JScrollPane ( ) ; listaDocumentos = new JList ( ) ; setDefaultCloseOperation ( WindowConstants . EXIT_ON_CLOSE ) ; panelCabecera . setBorder ( new MatteBorder ( null ) ) ; jLabel1 . setFont ( new Font ( "Tahoma" , 0 , 14 ) ) ; jLabel1 . setText ( "UNIDAD<seq2seq4repair_space>DE<seq2seq4repair_space>SERVICIOS<seq2seq4repair_space>EDUCATIVOS<seq2seq4repair_space>DE<seq2seq4repair_space>TLAXCALA" ) ; jLabel2 . setText ( "ESCANEO<seq2seq4repair_space>DE<seq2seq4repair_space>EXPEDIENTES<seq2seq4repair_space>LABORALES" ) ; jLabel3 . setText ( "Expedientes<seq2seq4repair_space>Escaneados:" ) ; jLabel4 . setText ( "Expedientes<seq2seq4repair_space>Completos:" ) ; txtExpedientesEscaneados . setText ( "100000" ) ; txtExpedientesCompletos . setText ( "100000" ) ; button1 . setCursor ( new Cursor ( Cursor . DEFAULT_CURSOR ) ) ; button1 . setLabel ( "Organizar<seq2seq4repair_space>Directorios" ) ; button1 . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { button1ActionPerformed ( evt ) ; } } ) ; GroupLayout panelCabeceraLayout = new GroupLayout ( panelCabecera ) ; panelCabecera . setLayout ( panelCabeceraLayout ) ; panelCabeceraLayout . setHorizontalGroup ( panelCabeceraLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addGroup ( panelCabeceraLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addContainerGap ( ) . addComponent ( jLabel3 , GroupLayout . PREFERRED_SIZE , 136 , GroupLayout . PREFERRED_SIZE ) . addGap ( 8 , 8 , 8 ) . addComponent ( txtExpedientesEscaneados , GroupLayout . PREFERRED_SIZE , 47 , GroupLayout . PREFERRED_SIZE ) . addGap ( 18 , 18 , 18 ) . addComponent ( jLabel4 ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( txtExpedientesCompletos , GroupLayout . PREFERRED_SIZE , 47 , GroupLayout . PREFERRED_SIZE ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) . addComponent ( button1 , GroupLayout . PREFERRED_SIZE , 208 , GroupLayout . PREFERRED_SIZE ) ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addGroup ( panelCabeceraLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addGap ( 344 , 344 , 344 ) . addComponent ( jLabel2 ) ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addGap ( 282 , 282 , 282 ) . addComponent ( jLabel1 ) ) ) . addGap ( 0 , 0 , Short . MAX_VALUE ) ) ) . addContainerGap ( ) ) ) ; panelCabeceraLayout . setVerticalGroup ( panelCabeceraLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addContainerGap ( ) . addComponent ( jLabel1 ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( jLabel2 ) . addPreferredGap ( LayoutStyle . ComponentPlacement . UNRELATED ) . addGroup ( panelCabeceraLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addGroup ( panelCabeceraLayout . createParallelGroup ( GroupLayout . Alignment . BASELINE ) . addComponent ( jLabel3 , GroupLayout . DEFAULT_SIZE , 26 , Short . MAX_VALUE ) . addComponent ( jLabel4 , GroupLayout . DEFAULT_SIZE , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) . addComponent ( txtExpedientesEscaneados , GroupLayout . DEFAULT_SIZE , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) . addComponent ( txtExpedientesCompletos , GroupLayout . DEFAULT_SIZE , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) ) . addGap ( 9 , 9 , 9 ) ) . addGroup ( panelCabeceraLayout . createSequentialGroup ( ) . addComponent ( button1 , GroupLayout . PREFERRED_SIZE , GroupLayout . DEFAULT_SIZE , GroupLayout . PREFERRED_SIZE ) . addContainerGap ( GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) ) ) ) ) ; panelSubSistema . setBorder ( BorderFactory . createLineBorder ( new Color ( 0 , 0 , 0 ) ) ) ; listaSubSistema . setBackground ( new Color ( 240 , 240 , 240 ) ) ; listaSubSistema . setFont ( new Font ( "Arial" , 0 , 14 ) ) ; <START_BUG> listaSubSistema . setForeground ( new Color ( 102 , 102 , 102 ) ) ; <END_BUG> listaSubSistema . setSelectionMode ( ListSelectionModel . SINGLE_SELECTION ) ; listaSubSistema . setCursor ( new Cursor ( Cursor . DEFAULT_CURSOR ) ) ; listaSubSistema . setFocusable ( false ) ; listaSubSistema . setRequestFocusEnabled ( false ) ; listaSubSistema . setSelectionBackground ( new Color ( 153 , 153 , 153 ) ) ; listaSubSistema . setVerifyInputWhenFocusTarget ( false ) ; listaSubSistema . setVisibleRowCount ( 0 ) ; scrollSubSistema . setViewportView ( listaSubSistema ) ; GroupLayout panelSubSistemaLayout = new GroupLayout ( panelSubSistema ) ; panelSubSistema . setLayout ( panelSubSistemaLayout ) ; panelSubSistemaLayout . setHorizontalGroup ( panelSubSistemaLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGap ( 0 , 217 , Short . MAX_VALUE ) . addGroup ( panelSubSistemaLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelSubSistemaLayout . createSequentialGroup ( ) . addGap ( 3 , 3 , 3 ) . addComponent ( scrollSubSistema , GroupLayout . PREFERRED_SIZE , 0 , Short . MAX_VALUE ) . addGap ( 3 , 3 , 3 ) ) ) ) ; panelSubSistemaLayout . setVerticalGroup ( panelSubSistemaLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGap ( 0 , 475 , Short . MAX_VALUE ) . addGroup ( panelSubSistemaLayout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( panelSubSistemaLayout . createSequentialGroup ( ) . addContainerGap ( ) . addComponent ( scrollSubSistema , GroupLayout . PREFERRED_SIZE , 453 , GroupLayout . PREFERRED_SIZE ) . addContainerGap ( GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) ) ) ) ; panelCT . setBorder ( BorderFactory . createLineBorder ( new Color ( 0 , 0 , 0 ) ) ) ; listaCT . setBackground ( new Color ( 240 , 240 , 240 ) ) ;

Fix:
listaSubSistema . setForeground ( new Color ( 255 , 255 , 255 ) ) ;